I'm quite happy with the process and the results (the water was yellow so SOMETHING came out, even if the major stains didn't- but I didn't used any detergent. If I had, I may have had more luck. So, next time- Orvus Paste).
Now I can move on to reconsolidating the loose pieces, which will be far more time consuming.


Prepping the distilled water bath with a makeshift frame lined with a polyethylene.

Banner unrolled onto screen and water added.


Submersion

Slightly wet process..

Bath water after soaking for a half hour.

Towel drying after removing from second soak.